The part number **ECJ2VB2D331M** refers to a specific type of **Multilayer Ceramic Chip Capacitor (MLCC)** manufactured by **Panasonic**. This component is designed for surface-mount applications and is widely used for filtering, decoupling, and smoothing in electronic circuits. --- ### 1. Part Number Breakdown To understand the technical specifications, we can decode the Panasonic part numbering system: | Segment | Code | Description | | :--- | :--- | :--- | | **Series** | `ECJ` | Panasonic Multilayer Ceramic Chip Capacitor series. | | **Size Code** | `2` | 0805 Imperial size (2.0 mm × 1.25 mm). | | **Characteristics** | `VB` | Temperature characteristic (usually refers to High Voltage application). | | **Voltage** | `2D` | Rated Voltage (200V DC). | | **Capacitance** | `331` | 330 pF (The '33' are significant digits; '1' is the multiplier $10^1$). | | **Tolerance** | `M` | ±20% capacitance tolerance. | --- ### 2. Key Technical Specifications Here are the primary electrical and physical characteristics of the component: * **Capacitance:** 330 pF (Picofarads) * **Voltage Rating:** 200V DC * **Dielectric Type:** Ceramic (Multilayer) * **Tolerance:** ±20% * **Package / Case:** 0805 (Metric 2012) * **Mounting Type:** Surface Mount (SMD/SMT) * **Operating Temperature:** Typically -55°C to +125°C (Standard for high-voltage MLCCs). --- ### 3. Physical Dimensions The 0805 footprint is one of the most common standard sizes for manual prototyping and automated assembly. | Dimension | Millimeters (mm) | Inches (in) | | :--- | :--- | :--- | | **Length (L)** | 2.00 ± 0.10 | 0.079 | | **Width (W)** | 1.25 ± 0.10 | 0.049 | | **Thickness (T)** | 0.85 ± 0.10 | 0.033 | --- ### 4. Typical Applications Due to its **200V rating** and small **330pF capacitance**, this part is generally used in: 1. **Snubber Circuits:** To protect switching transistors from voltage spikes. 2. **High-Frequency Filtering:** Removing noise in power supply lines. 3. **Telecom Equipment:** Used in circuits requiring moderate voltage isolation. 4. **DC-DC Converters:** Providing stability in power management stages. --- ### 5. Status Note > **Warning:** Many parts in the Panasonic ECJ series have been moved to **End of Life (EOL)** or "Discontinued" status as Panasonic shifted focus away from certain MLCC markets. If you are designing a new product, it is recommended to look for equivalents from manufacturers like Murata, TDK, or Kemet.